Calibration apparatus



June 9, 1959 c. w. woon ETAL cALIBRATIoN APPARATUS s sheets-sheet. 1

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CALIBRATION APPARATUS Filed May 9, 1956 5 Sheets-Sheet 5 I 3E INVENTORS.

' f//qf/ .Waan Bycaezrd/v .5M/0009A# nited States Patent i CALIBRATION APPARATUS Charles W. Wood, Lebanon, and Carlton W. Bondurant,

Dayton, Ohio, assignors to Standard-Thomson Corporation, Vandalia, Ohio, a corporation of Delaware Application May 9, 1956, Serial No. 583,725

11 Claims. (Cl. 73-1) This invention relates to a calibration apparatus. The invention relates more particularly to a calibration or adjustment apparatus for thermal responsive actuators of the type which includes a container provided'with thermal responsive material therein. However, the invention is not so limited in that the apparatus may be applied to numerous uses other than that of calibration of thermal responsive actuators.

This invention also relates to the method of calibration of thermal responsive actuators set forth in the co-pending application of Charles W. Wood, Serial No. 413,787, tiled March 3, 1954, now Patent No. 2,806,376, for Thermal Responsive Device, Charles W. Wood also being a co-inventor herein.

An object of this invention is to provide a high speed production apparatus for use in calibration and adjust- 'ment of thermal responsive actuators.

Another object of this invention is to provide an apparatus for calibration of a thermal responsive actuator which includes a container and in which the apparatus in addition to adjusting the volume of the container also forms the container so that indications of surrounding' temperature are accurately and swiftly transmitted to the contents of the container by conduction through the walls of the container.

Another object of the invention is to provide an automatic apparatus for calibration of thermal responsive actuators which apparatus may be operated eticiently and is long lived.

Other objects and advantages reside in the construction of parts, the combination thereof and the mode of operation, as will become more apparent from the following description.

In the drawings,

Figure l is a perspective view of a calibration apparatus of this invention.

Figure 2 is an enlarged fragmentary top planned view of a calibration apparatus of this invention.

Figure 3 is a section view taken substantially on line 3-3 of Figure 2. Figure 3 shows elements of the apparatus in operating positions. Y

Figure 4 is a section view similar to Figure 3 but with parts broken away. Figure 4 shows the elements of the apparatus in deactuated positions.

Figure 5 is a section view taken substantially on line S-S of Figure 2.

Figure 6 is a section view, with parts broken away, taken substantially on line 6-6 of Figure 2.

Figure 7 lis a section View taken substantially on line 7--7 of Figure 3.

Figure 8 is a section view showing a thermal responsive actuator prior -to calibration.

Figure 9 is a section view similar to that of Figure 8 showing a thermal responsive actuator following calibration or adjustment by an apparatus of this invention.

Referring to the drawings in detail, Figure 8 shows a thermal responsive actuator 12 of a type which an apparatus of this invention is adapted to calibrate.` The ,ther-4 2,889,700. Patented June 9, 1959' mal responsive actuator 12 comprises a cup or container or casing member 14 which has a disc or cover member 16 at one end thereof. Within the container member 14 is an elastic body 18 which has a flange 20 at one end thereof in engagement with the disc or cover member 16. Surrounding the body of elastic material 18 within the container 14 is an expansible-contractible material 22.

The elastic body 18 is provided with a longitudinal centrally located cavity 24 therein which is open at the end thereof adjacent the cover member 16. The cover member 16 is provided with an aperture therethrough which is in alignment with the cavity 24 within the elastic body 18. The cavity 24 is adapted to receive an actuatory rod 26 which has an end portion disposed within the cavity 24, as shown inFigure 9.

The expansible-contractible material 22, as shown in Figure 8, does not occupy all of the space within the container 14 which is not occupied by the elastic body 18.

The apparatus of this invention is adapted to adjust the temperature as described in the aforementioned co-pending application Serial No. 413,787. The temperature at which the container 14 is maintained is the desired operating temperature of the thermostatic actuator 12. The

calibration apparatus 30 of this invention comprises a base member 32 upon which is rotatably mounted a table member 34, as shown in Figure l. Rigidly mounted upon the table member 34 are a plurality of block members 36, all of which are disposed equidistantly from the Arotational axis of the table member 34. Reciprocally mounted upon each of the block members 36 are a pair of leg members 38. Each pair of leg members 38 supports a pedestal member'fltl. A pair of compression spring members 42 are disposed between each pedestal member 40 and its respective block member 36.

Upon each pedestal member 40 is rigidly attached a carrier plate or carriage member 44. Each carriage member or carrier plate 44 is provided at the upper surface thereof with an annular recess 46 which has an aperture 48 concentric therewith, as shown in Figure 2. The aperture 48 extends through the carrier plate 44, as shown in Figures 3, 4 and 6. The recess 46 is adapted to serve as a seat to retain a casing member 14, as shown in Figures 3, 4, 6, 8 and 9.

A support structure 50, disposed in spaced relation from the base 32, supports a piston cylinder 52 above the table 34, as shown in Figure 1. The piston cylinder 52 carries a piston rod 54, extending therefrom, which v is vertically movable toward and away from the table 34. Firmly attached to the piston rod 54 at the lower'v Also within the cavity.

the drum mem-ber 60 downwardly within the head 56. The drum member 6l) is provided with a peripheral shoulder 64 which engagesv i,

cesareo an vinternal Shoulder 66 of the head 56 for .limiting the downward movement of the drum 60 within the head 56.

Attached to the lower end of the drum 60 is a bearing plate 70 which is secured thereto by means of bolt members 72. Attached to the Vbearing plate 70 and disposed in spaced relation therefrom is an engagement plate 74, as shown in Figures 3 and 4. The engagement plate 74 supports a plurality of movable jaw members 78 which are disposed between the bearing plate 70 and the engagement plate 74. The engagement plate 74 is attached to the bearing plate 70 by means of a plurality of intermediate plates 75. The intermediate plates 75 are interposed among the jaw members 78 within the plane of the jaw members 78. The intermediate plates 75 may be attached to or integral with the engagement plate 74 and are attached to the bear ing plate 70 by means of bolts 77, as shown in Figure 7. The engagement plate 74 is provided with a central aperture 73, shown in Figure 4, for receipt of a container 14.

The jaw members 78 are slidably movable upon the engagement plate 74 and are guided by the intermediate plates 75. The jaw members 78 have the longitudinal axes thereof radially disposed with respect to the central a-Xi's of the drum 60. The engagement plate 74 is provided With a plurality of heater elements 80 for the purpose of heating the engagement plate 74 and the jaw members 78. The reason for heating the engagement plate 74 and the jaw members 78 is discussed below.

Within the head or shell 56 and attached at the lower internal surface thereof are a plurality of cam members or tapered blocks 82 which are secured to the head 56 by means of bolt members 84, as shown in Figures 3, 4, and 7. The jaw members 78 slidably engage the cam members 82 so that the jaw members 78 are moved toward the center of the head V56 upon movement of the drum 60 with respect to the head 56.

At the central portion of the drum 60 and axially movable therein is a slide wedge 88 which is urged downwardly within the drum 60 by means of a spring member 90. The slide wedge 88 has a tapered peripheral lower edge and is used to urge the jaw members 78 one from the other and thus causes the jaw members to separate when the drum member 60 is in its lowermost position as shown in Figure 4.

Centrally located within the wedge 88 and extending therefrom at the lower end thereof is a pin 94 which is urged downwardly by means of a spring 96. The compression of the spring 96 is adjustable by means of a rod 98 which is axially aligned above the wedge 88 and is threadedly adjustable within the drum 60. The purpose of the pin 94 is discussed below.

.Also carried by the support structure 50 and disposed below the head member 56 are a plurality of vertical abutment posts 100, shown in Figures 3 and 4. Carried by the support structure 50 adjacent the abutment posts 100 is a bearing support assembly 102, shown in Figure 6. The bearing support assembly 102 carries bearing members 106 within which is a vertically disposed shaft member 108 which is axially movable within the bearing members 106. Threadedly attached to the shaft 108 are stop nut members 110 and 111. Encompassing the shaft 108 is a helical spring 112 which is compressed between one of the nuts 110 and the lower portion of the bearing support assembly 102, as shown in Figures 3, 4 and 6. The spring 112 urges the shaft 108 upwardly so that the stop nut 111 normally engages the upper portion of the bearing support assembly 102, as shown in Figure 4.

.As shown in Figures 3 and 4, a bracket member 114 isattached by means of clamps 116 to the shaft 108. At the end of the bracket 114 is a vertically extending pin 118 which is adapted to actuate a switch 120 which is provided with an actuator finger 122. The switch 120 is connected by means of any suitable electrical conductor 123 to a solenoid valve 124. The solenoid valve 124 is adapted to control the supply of fluid to the piston cylinder 52, by means of a fluid valve 128 which is supplied through a reservoir 130.

A suitable pressure indicator 132 may be placed in a fluid line 134 leading from the reservoir 130 to the fluid valve 128. The switch and the solenoid 124 are connected to any suitable source of electrical energy by means of lines L1 and L2 shown in Figure 3.

As shown in Figures 3, 4 and 6, each carriage member 44 is provided with a plurality of heater elements 140. The means for supplying electrical energy to these heater elements is now described.

As shown in Figure 5, rigidly mounted upon the table 34 at the central portion thereof is a support block 142, which rotates with the table 34. Upon the support block 142 is mounted a pair of horizontally disposed slip rings 144 and 146 which are rigidly secured to the support block 142. Positioned above the slip rings 144 and 146 and in axial alignment therewith is a conduit 148 which carries a pair of electrical conductors 150 which extend upwardly and 'connect toa suitable source of electrical energy. The conduit 148 supports a cover member 152 within which is disposed the slip rings 144 and 146. Also within the .cover member 152 and carried thereby are a pair of vertical contact studs 154 each of which is electrically connected to one of the conductors 150. Each of the contact studs 154 slidably engages one of the slip rings 144 and 146. Conductor members 158 are attached to the slip rings 144 and 146 and connect to the heater elements 140 of the carrier plates 44 through conduits and 161, as shown in Figures 2, 5 and 6. Thus, the heater elements 140 of the carrier plate 44 continuously heat the carrier plates 44 even though the carrier plates 44 'are disposed upon the rotatable table 34.

Conductor leads 165, shown in Figure 7 enter the bottom end of the drum 60 through the engagement plate 74 and connect to the heater elements 80. These conductor leads are supported exterior of the drum 60 and the head S6 by any suitable flexible cable (not shown).

Operation As stated above, a supply of thermal responsive actuators 12 as shown in Figure 8 are maintained at a temperature which is the desired operating temperature of the actuators. Actuators 12 are removed individually from said supply thereof and one actuator 12 is placed upon each of the carrier plates 44 as shown in Figure l. Thus, each container 14 is seated within the recess 46 'of each carrier plate 44.

The table 34 is rotated by any suitable means until a carriage member 44 with an actuator 12 disposed thereon is "disposed immediately below the head member 56 as shown in Figure 4.

Due to the fact that the carrier plates 44 are heated by the heater elements 140 therewithin, the containers disposed thereupon are maintained at constant temperature while they are supported by the carrier plates 44.

Any suitable control means may be used to operate the solenoid valve 124 to cause duid from the reservoir 130 to ow into the piston cylinder 52 for operation `of the piston 54 to which the head member or shell 56 is attached. Thus, the head member 56 is moved toward the carriage member 44 so that the engagement plate 74 of the drum 60 engages the carriage member 44, as shown in Figure 3. During further movement of the engagement plate 74 toward the abutment posts 180 the engagement plate 74 moves the carrier plate or carriage `member A44 downwardly, against the resiliency of the springs 42. The pin 26 thus becomes positioned within the aperture 48 ot the carrier plate 44. Furthermore, the container 14 carried by the carriage member 44 is engaged by the engagement plate 74 as the container 14 `is disposed within the aperture 73, as shown in Figure 4. Thus, the container 14 is moved downwardly so that the pin 26 is positioned within 'the cavity 24 of the elastic assavoo body 18. The carrier member 44 is moved downwardly by the engagement plate 74 until the engagement plate 74 engages the abutment posts 100. When this occurs, the pin 26 is snugly positioned within the elastic body 18 and extends the entire length of the cavity 24.

The head member 56 continues to move downwardly after the engagement plate 74 has engaged the abutment posts 100. Thus, the drum member 60 moves axially within the head or shell S6. Consequently, the jaw members 78 are forced to move along the cam members 82 so that the jaw members 78 are -forced inwardly toward the container 14. The jaw members 78 thus engage the container 14 forcing the side walls of the container inwardly, as shown in Figures 3, 6 and 9.

Due to the fact that the engagement plate 74 and the jaw members 78 are heated by the heater elements 80, as described above, a container 14, disposed as shown in Figure 3, is maintained at the desired temperature during operation thereupon. j

As the wall members of the container 14 are forced inwardly, the volumetric capacity of the container 14 decreases so that the eXpansible-contractible material 22 lls all of the unoccupied space within the container 14, as shown in Figure 9. When the container 14 is completely filled, as the jaw members 78 force the walls of the container 14 inwardly, further inward movement of the jaw members 78 causes the expansible-contractible material 22 to squeeze the elastic body 18, thus tending to close the cavity 24 therein. Thus, the walls of the cavity 24 of the elastic body 18 are slightly distorted, forcing the actuator rod 26 to begin to move in a direction from the container 14.

When the actuator rod 26 is caused to move slightly in a direction from the container 14, the shaft 108 is caused to move downwardly against the pressure of the spring 112. This causes the pin 118 attached to the bracket 114 to operate the switch 120 through the actuator finger 122, as shown in Figure 3. Thus, the switch 120 causes the solenoid Valve 124 to operate in such a manner that the fluid within the piston 52 moves the head member 56 upwardly.

As the head member 56 moves upwardly, the jaw members 78 are forced outwardly from the container 14 by means of the wedge 88. Also, as the head member 56 moves upwardly, the pin member 94 which is in engagement with the container 14, as shown in Figure 3, urges the container 14 to remain positioned in the recess 46 of the carrier 44.

As the head member 56 rises above the carriage member '44 and returns to its uppermost position, the table 34 is caused to rotate in the direction shown in Figure 1 until the next carriage member 44 is disposed directly under the head 56, as shown in Figure 4. Then the operation described above is repeated.

As the table 34 rotates, each container 14 which has been calibrated, as discussed above, is carried by its respective carriage member 44 and is moved by the carriage member 44 until the calibrated container comes into contact with an arm 164 which is disposed at the upper end of a chute 166 adjacent the table 34, as shown in Figure 1. As the container 14 thus comes into engagement with the arm 164, the container 14 is caused to drop from the carrier 44 into the chute 166 and drops downwandly in the chute 166 and away from the calibration apparatus. Each carrier plate 44 thus has a calibrated actuator 12, in the form shown in Figure 9, removed therefrom following calibration thereof so that a subsequent uncalibrated actuator 12, as shown in Figure 8, may be disposed upon the carrier plate 44, as shown in Figure 1.

Thus, it is understood that the calibration apparatus of this invention provided means by which thermostatic actuators may bequickly and accurately calibrated in a production line operation so that a large number of 6 thermostatc actuators may be calibrated within a short period of time.

Although the preferred embodiment of the device has been described, it will be understood that within the purview of this invention various changes may be made in the form, details, proportion and arrangement of parts, the combination thereof and mode of operation, which generally stated consist in a device capable of carrying out the objects set forth, as disclosed and defined in the appended claims.

Having thus described our invention, we claim:

l. In an automatic apparatus for depressing the walls of a container, comprising a reciprocally operable shell member, a carrier member movable to carry a container to a position adjacent the shell member, the shell member having a cavity therein open at the end thereof adjacent the carrier member, a drum reciprocally movable within the shell member, the drum being movable along the line of movement of the shell member, resilient means within the shell member urging the drum toward the carrier member, jaw means carried by the drum within the shell member and movable along a line normal to the line of movement of the drum, cam means within the shell member and engageable with the jaw means for operation thereof, the shell member being movable to engage the drum with the carrier member, the jaw means having spaced-apart engagement portions engageable with spaced-apart portions of a container retained by the carrier member to depress a plurality of portions of the walls of the container so that a plurality of spaced-apart depressions are formed in the walls of the container.

2. In a calibration apparatus for an actuator assembly which includes a container having therein an elastic body, the elastic body having an elongate cavity therein, the elastic body abutting an enclosing wall of the container, the container having an aperture in said enclosing wall and in alignment with the cavity of the elastic body, an expansible-contractible material within the container, the

lapparatus comprising a table, a carriage resiliently supported by the table, the carriage being adapted to sup port a container, a head member, means for reciprocally moving said head member toward and away from the table, the head member having a cavity therein open at the end thereof which faces the table, a drum member within the cavity of the head member and reciprocally movable therein toward and away from the table, a resilient member within the head member and abutting the drum member urging the drum member in a direction from the cavity, the drum member having a shoulder portion limiting the amount of movement thereof in the direction toward the table, the drum member having an orice therein at the surface thereof facing the table, the orifice being adapted to receive a container of an actuator assembly, a cam member attached to the internal surface of the cavity of the head member, a plurality of jaw members carried by the drum member and recip rocally movable in directions normal to the direction of movement of the drum member, the jaw members being engageable with the cam member and movable toward the orifice of the drum member upon relative mover ment between the drum member and the head member, the head member being movable to engage the drum member thereof with the carriage member, the container thus extending through the oriice of the drum member,

a pin member carried by the support structure and directed toward the drum member, the head member being movable toward the table after engagement of the drum member with the carriage, the carriage thus being resiliently moved toward the table by movement of the drummember carried by the head member, the container member thus being moved to engage the pin member so that the pin member extends into the container and into the cavity of the elastic body, an abutment member below the vhead memberand engageable by the drum upon downward movement of the head member, the head member thus moving relative to the drum member, the jaw members thus being moved by the cam member, the jaw members thus engaging the container pressing inwardly upon the walls of the container, each of the jaw members having an engagement portion, the engagement portion of each jaw member being spaced from the engagement portion of adjacent jaw members, the jaw members thus engaging spaced-apart portions of the walls of the container, engagement of the jaw members thus causing a plurality of spaced-apart depressions in the walls of the container, inward movement of the walls of the container causing the eXpansible-contractible material to squeeze the elastic body so that the elastic body moves the pin member, and means operable by movement of the pin member to control the means for reciprocally moving the head member.

3. In a calibration apparatus for an actuator assembly which includes a container, the apparatus comprising a table, a carriage resiliently supported by the table, the carriage being adapted to support a container, a head member, means for reciprocally moving said head member toward and away from the table, the head member having a cavity therein open at the end thereof which faces the table, a drum member within the cavity of the head member and reciprocally movable therein toward and away from the table, a resilient member within the head member and abutting the drum member urging the drum member from the cavity, the drum member having an orifice therein at the surface thereof facing the table, the orifice being adapted to receive a container of an actuator assembly, a cam member attached tov the internal surface of the cavity of the head member, a plurality of jaw members carried by the drum member and reciprocally movable in directions normal to the. directionv of movement of the drum member, the jaw members being engageable with the cam member and movable thereby toward the orifice of the drum vmember upon relative movement between the drum member and the head member, the head member being movable to engage the drum member thereof with the carriage, the container thus extending through the orifice of the drum member, the head member being movable toward the table after engagement of the drum member with the carriage, abutment means engageable by the drum to limit the downward movement thereof, the head member thus moving relative to the drum member, the jaw members thus being moved by the cam member, each of the jaw mem-` bers having an engagement portion, the engagement portion of each jaw member being vspaced from the engagement portion of adjacent jaw members, the jaw members thus engaging spaced-apart portions of the walls of the container, engagement of the jaw members. thns causing a plurality of spaced-apart depressions in the walls of the container.

4. In an apparatus for calibration of a thermal responsive actuator inclu-ding a container having enclosing Walls, an elastic body within the container, the elastic body having an elongate cavity therein, the container having an aperture therein in alignment with the: cavity in the elastic body, a fluid material within the container engaging the elastic body, the combination comprising support structure, a rotatable table carried by the support structure, a plurality of carriage members carried by the table and vertically movable thereupon, resilientA means urging the carriage members from the table, each carriage member having a seat onv the upper surface thereof adapted to support the container, each. carriage member having an aperture therethrough at the center ofthe seat, a head member disposed above one of the carriage members and reciprocally movable toward and away from the carriage member, a drum within the head and reciprocally carried therein, resilient. means within` the head urging the drum toward the carriageV member, the head member being movable for engagement of the drum with the carriage member, abutment means below the head member and engageable by the drum during movement of the head member toward the table, engagement of the drum with the abutment means with continued movement of the head member thus causing movement of the drum within the head member against forces of the resilient member, a plurality of radially positioned jaw members within the head member movable transversely to the line of movement of the head member, the jaw members having spaced-apart engagement portions, a plurality of cam members attached within the head member and engageable with the jaw members for move ment of the jaw members, a pin member attached to the support structure below the head member and concentric therewith, the head member being movable downwardly to engage the carriage member, the carriage member being movable downwardly by the head member so that the pin member extends into the cavity of the elastic body of the container through the aperture therein, the jaw members being movable by the cam members so that the engagement portions thereof engage the container forcing spaced-apart portions of the enclosing walls of the container inwardly, the jaw members thus forcing a plurality of spaced-apart depressions in the enclosing walls of the container, the volume of the container thus being reduced so that the uid material fills all unoccupied space within the container, the huid material also applying pressure upon the elastic body causing the pin member to move within the cavity thereof, and automatic means attached to the pin member for causing upward movement of the head member upon slight movement of the pin member.

5. In a mechanism for depressing the walls of a container, a head member, jaw means carried by the head member, cam means carried by the head member and engageable with the jaw means for operation of the jaw means, a carrier member adapted to carry a container, means for producing relative movement between the carrier member and the head member for engagement of said members one with the other, the last said means also including means for producing relative movement between the cam means and the jaw means, the jaw means being operable to engage a container held by the carrier member to depress the walls of the container'.

6. In an apparatus for performing work upon a group of container members in seriatim relation while the containers are maintained at constant temperature, the combination comprising a base member, a table rotatably mounted upon the. base member, a plurality of carriage members mounted upon the table, each of the carriage members being adapted to support a container member, heater means within each carriage member, conductor members connectedy to each of the heater means, slip ring members connecting each ofthe conductor members to a source of electrical energy, a head member movable toward and away from the table, the table being rotatable to position any one of the carriage members in aligned relation with the head member, the head member being movable to engage a carriage member disposedV in alignment therewith, jaw means carried by the head member and engageable with a container member supported by the carriage member which is in engagement with the head member, cam means carried by the head member and operable by movement thereof for operation of the jaw means, and heater means carried by the head member for heating the jaw means.

7. In a calibration apparatus for a thermal responsive actuator which includes a container, the container being elongate in shape, the container having end walls and substantially cylindrical side walls the combination cornprising a carrier member for supporting a container upon one of the end walls thereof, a head' member, theV head member having a cavity therein open at one end thereof, a drum within the cavity of the head member and reciprocally movable therein, resilient means urging movement of the drum relative to the head member, jaw means carried by the drum, cam means supported by the head member in engagement with the jaw means for operation thereof, the jaw means being operable upon relative movement between the drum and the head member, the jaw means being movable along a line substantially normal to the line of movement of the drum, means for causing relative movement between the carrier member and the head member so that the drum and the carrier member come into engagement one with the other, the last said means also causing relative movement between the head member and the drum upon engagement between the drum and the carrier member, the jaw means having spaced-apart engagement portions contacting spaced-apart portions of the side walls of the container depressing the portions of the side walls of the container.

8. In a calibration apparatus for a thermal responsive actuator which includes a container, the container being substantially elongate and cylindrical in shape, the container having end Walls and side Walls, the combination comprising a carrier member for supporting a container upon one of the end walls thereof, a shell member disposed in spaced relation from the carrier member, the shell member having a cavity therein open at an end thereof facing the carrier member, a drum within the cavity of the shell member and reciprocally movable therein in directions toward and away from the carrier member, jaw means within the shell member, camL means within the shell member in engagement with the jaw means for operation thereof, means for causing relative movement between the carrier member and the shell member so that the drum and the carrier member come into engagement one with the other, the jaw means having spaced-apart engagement portions engageable with spaced-apart portions of the side walls of the container depressing the portions of the side walls of the container.

9. In a calibration mechanism for a thermal responsive actuator which includes a container, the container being elongate and having a pair of end walls and substantially cylindrical side walls, the combination comprising a hollow shell member open at one end thereof, a drum member carried by the shell member and reciprocally movable therewithin, a cam member attached to the internal Walls of the shell member adjacent the open end thereof, jaw means movably carried by the drum member and engageable with the cam member, means urging the jaw means toward the cam member, the jaw means being radially movable toward the longitudinal axis of the drum by relative movement between the drum member and the shell member, the jaw means having spaced-apart engagement portions engageable with spacedapart portions of the side walls of a container positioned concentric with the central axis of the drum for depressing the portions of the side walls of the container so that spaced-apart depressions are formed in the side walls of the container.

10. In a mechanism for performing work upon an article of manufacture, a carrier member for supporting an article of manufacture, a head member disposed in spaced relationship from the carrier member, jaw means supported by the head member, means for causing relative movement between the head member and the carrier member to cause engagement of said members one with the other, means carried by the head member and engageable with the jaw members for causing operation of the jaw members upon relative movement between the carrier member and the head member, the jaw means having spaced-apart engagement portions engageable with spacedapart portions of an article of manufacture held by the carrier member for forcing depressions in the article of manufacture.

11. In a calibration apparatus for a thermal responsive actuator which includes a container, the container being elongate in shape, the container having end walls and substantially cylindrical side Walls, the combination comprising a carrier member for supporting a container upon one of the end walls thereof, a head member, the head member having a cavity therein open at one end thereof, a drum Within the cavity of the head member, jaw means carried by the drum, cam means supported by the head member in engagement with the jaw means for operation thereof, the jaw means being movable along a line substantially normal to the line of movement of the drum, means for causing relative movement between the carrier member and the head member so that the drum and the carrier member come into engagement one with the other, the jaw means having spaced-apart engagement portions engageable with spaced-apart portions of the side walls of the container depressing the portions of the silde walls of the container so that spaced-apart depressed areas are formed in the container.

References Cited in the file of this patent UNITED STATES PATENTS 2,636,776 Vernet Apr. 28, 1953 2,714,759 Von Wangenheim Aug. 9, 1955 2,755,839 Garrock et al. July 24, 1956 

